Material Testing and Modeling of Aluminum Alloy Sheet in Support of Forming Simulations

Abstract

This lecture emphasizes the usefulness of material modeling to improve the predictive accuracy in the forming simulations of aluminum alloy sheets, and consists of part I and II. In part I, we present a numerical simulation of sheet necking on the basis of an elastic-viscoplastic crystal plasticity model. In this model, a sheet possessing an initial imperfection in the form of a reduced thickness band is postulated, and the growth of the band caused by the strain localization is analyzed. Our attention is focused on the impact of the r-value for the stretchability of aluminum alloy sheet. In part II, we demonstrate the effect of phenomenological material modeling on the predictive accuracy of finite element analysis (FEA). It is concluded that the biaxial tensile testing method using a cruciform specimen is an effective material testing method for accurately detecting and modeling the deformation behavior of sheet metals under biaxial tension. PU - JOHN WILEY & SONS PI - CHICHESTER PA - THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND